Android编程实现GridView控件点击图片变暗效果的方法

本文实例讲述了android编程实现gridview控件点击图片变暗效果的方法。分享给大家供大家参考，具体如下：

@override
public void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_main);
  grid = (gridview) findviewbyid(r.id.grid);
  grid.setadapter(new gridadapter());
  grid.setonitemclicklistener(new onitemclicklistener() {
    @override
    public void onitemclick(adapterview<?> arg0, view arg1, int arg2,
        long arg3) {
      toast.maketext(mainactivity.this, "ddd", 1000).show();
    }
  });
}
class gridadapter extends baseadapter {
  @override
  public int getcount() {
    return imgs.length;
  }
  @override
  public object getitem(int arg0) {
    return arg0;
  }
  @override
  public long getitemid(int arg0) {
    return arg0;
  }
  @override
  public view getview(int arg0, view view, viewgroup arg2) {
    if (view == null) {
      holder = new viewholder();
      view = layoutinflater.from(mainactivity.this).inflate(
          r.layout.imgs, null);
      holder.view = (imageview) view.findviewbyid(r.id.gridimg);
      view.settag(holder);
    } else {
      holder = (viewholder) view.gettag();
    }
    holder.view.setimageresource(imgs[arg0]);
    holder.view.setontouchlistener(ontouchlistener);
    return view;
  }
  class viewholder {
    imageview view;
  }
  public ontouchlistener ontouchlistener = new view.ontouchlistener() {
    @override
    public boolean ontouch(view view, motionevent event) {
      switch (event.getaction()) {
      case motionevent.action_up:
        changelight((imageview) view, 0);
        // onclick
        break;
      case motionevent.action_down:
        changelight((imageview) view, -80);
        break;
      case motionevent.action_move:
        // changelight(view, 0);
        break;
      case motionevent.action_cancel:
        changelight((imageview) view, 0);
        break;
      default:
        break;
      }
      return true;
    }
  };
}
private void changelight(imageview imageview, int brightness) {
  colormatrix matrix = new colormatrix();
  matrix.set(new float[] { 1, 0, 0, 0, brightness, 0, 1, 0, 0,
      brightness, 0, 0, 1, 0, brightness, 0, 0, 0, 1, 0 });
  imageview.setcolorfilter(new colormatrixcolorfilter(matrix));
}

更多关于android相关内容感兴趣的读者可查看本站专题：《android控件用法总结》、《android开发入门与进阶教程》、《android视图view技巧总结》、《android编程之activity操作技巧总结》、《android数据库操作技巧总结》及《android资源操作技巧汇总》

希望本文所述对大家android程序设计有所帮助。